Ebe mgbaze crystallization nke PTFE bụ 327 ℃, mana resin enweghị ike ịdị na steeti agbaze ruo mgbe ọ dị n'elu 380 ℃, na viscosity gbazee dị elu dị ka 1 010 Pa * S.Na mgbakwunye, PTFE nwere ike mgbaze na-eguzogide.Ya mere, ọ nweghị ike gbazee usoro nhazi, enweghị ike igbari usoro nhazi, na-emekarị mmepụta nke ngwaahịa ya nwere ike ịdị ka ígwè na seramiiki nhazi - sample, mbụ ntụ ntụ compaction, mgbe ahụ sintering na n'ibu nhazi, ma ọ bụ site extrusion ịkpụzi, isotactic ịpị. ịkpụzi, mkpuchi mkpuchi na ịkpụzi calendering na ụzọ ndị ọzọ nke nhazi.
Ebe mgbaze crystallization nke PTFE bụ 327 ℃, mana resin enweghị ike ịdị na steeti agbaze ruo mgbe ọ dị n'elu 380 ℃, na viscosity gbazee dị elu dị ka 1 010 Pa * S.Na mgbakwunye, PTFE nwere ike mgbaze na-eguzogide.Ya mere, ọ nweghị ike gbazee usoro nhazi, enweghị ike igbari usoro nhazi, na-emekarị mmepụta nke ngwaahịa ya nwere ike ịdị ka ígwè na seramiiki nhazi - sample, mbụ ntụ ntụ compaction, mgbe ahụ sintering na n'ibu nhazi, ma ọ bụ site extrusion ịkpụzi, isotactic ịpị. ịkpụzi, mkpuchi mkpuchi na ịkpụzi calendering na ụzọ ndị ọzọ nke nhazi.
1. Ịkpụzi
Ịkpụzi ugbu a bụ usoro ịkpụzi a kacha eji eme ihe maka PTFE.Nkà na ụzụ ịkpụzibụ ụfọdụ ihe na-akpụzi (ntụ ntụ, granule, fibrous ihe, wdg) n'ime metal ebu, na --obere okpomọkụ, nrụgide - - usoro nke akpụ.Ọ bụghị nanị n'ịdị arọ molekụla ha kpara polymer kpụrụ akpụ, na ihe fọrọ nke nta ka ọ bụrụ plastik nile nwere ike ịkpụzi.Isi atụmatụ nke ịkpụzi bụ;Ọnụ ala dị ala, ngwa dị mfe, ntinye ego dị ala, ọ bụghị nanị site na ịdị arọ nke molekụla nke plastik a na-edozi;Ọdịmma ya bụ nrụpụta nrụpụta dị ala, oke ọrụ ike yana àgwà ngwaahịa anaghị akwụsi ike.PTFE dị arọ molekụla dị elu yana oke mmiri na-adịghị mma.Mgbe ndị ọzọ nhazi ụzọ na-eto eto, PTFE ngwaahịa na-tumadi esichara site ịkpụzi n'ụwa nile.
Na ịkpụzi nwere ike kewaa n'ime ụzọ ise dị iche iche nke kpọmkwem usoro: (1) ịpị - sintering a ịpị usoro (a makwaara dị ka free sintering usoro); usoro (5) n'out oge ịpị na sintering usoro.
2. Hydroform usoro
Usoro nrụgide hydraulic, nke a makwaara dị ka usoro nhata, usoro nrụgide isobaric ma ọ bụ usoro ịkpụzi rọba, bụ ịgbakwunye resin PTFE n'etiti akpa na mgbidi ebu, wee banye na akpa ahụ n'ime mmiri mmiri (mmiri a na-ejikarị), nrụgide nke akpa rọba na mgbasawanye mgbidi ebu, na-agbakọ resin ma ghọọ ngwaahịa a na-emepụta - usoro.Enwere ike iji usoro a rụpụta nnukwu aka uwe, tankị nchekwa ala, shei hemispheric, kọlụm ụlọ elu, nnukwu slab, wdg, yana ngwaahịa dị mgbagwoju anya nwere usoro ihe mejupụtara PTFE, dị ka tee, elbow na profaịlụ.Uru ndị bụ isi nke ịkpụzi hydraulic bụ usoro dị mfe nke akụrụngwa na ịkpụzi - ihe mgbapụta mmiri nkịtị na-edochi akwa akwa akwa akwa, na ngwaahịa ndị a na-agbakọ n'otu n'otu na nke ukwuu - na-akpata imepụta nnukwu ihe, ụdị dị mgbagwoju anya na usoro lining dị mfe. .
3. Push ịkpụzi
A na-akpọkwa nrụgide nrụgide dị ka tapawa extrusion ịkpụzi, 20-30 ntupu sieve nke chụsasịrị resin na organic mgbakwunye (toluene, petroleum ether, ihe mgbaze mmanụ, ruru nke resin arọ 1/5) agwakọta n'ime a mado, prepress n'ime nnukwu mgbidi cylindrical oghere. , wee tinye n'ime push pịa igwe gbọmgbọm, n'okpuru kpo oku na plunker push ịkpụzi.Mgbe ihicha na sintering na okpomọkụ nke 360 ~ 380 ° C, ike na siri ike push na nrụgide tube na mmanya ngwaahịa na-enwetara mgbe obi jụrụ.Ngwaahịa na-agbanye na ịpị na-ejedebe na mkpanaka nke nwere dayameta nke 16mm ma ọ bụ obere na ọkpọkọ nwere mgbidi mgbidi nke 3mm ma ọ bụ obere.
4. Spiral extrusion ịkpụzi
The ịghasa extruder nke PTFE ntụ ntụ dị iche na extruder eji ndị ọzọ thermoplastic plastics.Ịkpụzi extrusion nke plastik thermoplastic nkịtị bụ ịkwanye ihe ahụ n'ihu site n'enyemaka nke ntụgharị ntụgharị, ka ọ dị ugbu a ịpịkọta, ịkwachaa na ịgwakọta ihe.A na-agbazekwa ihe ahụ site na ọkụ na-emepụta site na ike ịkwa akwa na ikpo ọkụ dị n'èzí nke cylinder ihe.Otú ọ dị, ịghasa nke PTFE extruder naanị na-arụ ọrụ nke ibufe na ịkwanye, nke mere na ihe na-agafe n'isi nke otu-ịghasa extruder na abụọ-isi eri na otu pitch na omimi, wee banye n'ime ọnụ ebu maka. sintering na jụrụ, na ụdị na nrụgide nke ngwaọrụ counter-nrụgide na-enye iji nweta nzube na-aga n'ihu.Ọ na-esikarị ike ịhazi PTFE site na otu ịghasa extruder.Ọnụ ọgụgụ esemokwu dị ala nke PTFE ntụ ntụ na-akpata skidding n'oge usoro nri, nke na-ebelata oke ikike ibufe ihe nkedo.Na n'ihi esemokwu okpomọkụ, nwekwara ike ime ka ntụ ntụ adhesion na ịghasa ma ọ bụ gbọmgbọm, na-eme nri ndị ọzọ siri ike na-ejighị n'aka.
N'ime afọ ndị na-adịbeghị anya, ejirikwa ejima-screw tinye n'ọrụ nhazi ihe nke ọdịdị pụrụ iche.Ụkpụrụ nri ya dị iche na nke otu-screw extruder, ọ na-enwekwa ọrụ njem njem dị mma, nke nwere ike imeri nsogbu sliding nke UHMWPE ntụ ntụ na kposara ma mee ka ikike nri nke kposara dị mma.The counter-na-atụgharị ejima-ịghasa extruder nwere mma ịgwakọta na homogenization mmetụta karịa otu-direction ejima-screw extruder, ma n'ihi na ya ibu nkewa ike, ịkpacha ajị ihe na ọdịiche nke ịghasa bụ ibu, nke na-eme ka ihe na-ekpo ọkụ. , na ịdị arọ molekụla nke extruder nwere ike ịdaba ihe dị ka 40%. Ọ bụrụ na ọdịiche dị ukwuu na nkedo adịghị etinye aka, ihe ahụ ga-arapara na ígwè ọkụ.Otú ọ dị, iji otu ntụgharị nke ejima ịghasa extruder, ọ dịghị nsogbu dị otú ahụ.Ihe na extruder site ịkpacha ajị omume nke nta, plasticizing chọrọ nke ukwuu nke okpomọkụ, niile si gbakwunyere okpomọkụ isi iyi, na otú nwere ike ịbụ kpọmkwem akara, nke nwere ike ime ka ihe na extrusion usoro iji belata okpomọkụ mmebi, n'otu oge ahụ na. iji nọgide na-enwe eruba ihe nke nkịtị na kwụsie ike na imi, imi ngalaba size nke imewe kwesịrị dakọtara na olu nke ịghasa ebu ihe.Ọsọ screw adịghị ngwa ngwa, n'ozuzu ihe dị ka 10 revolutions kwa nkeji.Iji zere ihe na-arapara na mberede n'elu igwe, a ghaghị ịchịkwa okpomọkụ extrusion nke ọma.
5. Plunger extrusion ịkpụzi
Plunger extrusion nhazi plastik, nhazi plastik bụ usoro oge ochie, ebe ọ bụ na ihe a malitere, ndị mmadụ malitere iji usoro a na-edozi plastik.A na-ahazi PTFE site na ịpịpụta resin quantitative n'ime oghere ntinye, na-eme ka plunger nwetaghachi ma pịa ya n'ime ngwaahịa emepụtara.Ya mere azụ na azụ, na ọnụ ebu na-etolite a multi – ogbo tupu – ịkpụzi ngwaahịa.N'ihi esemokwu n'etiti PTFE resin na esemokwu n'etiti PTFE resin na mgbidi ebu, na mmụba olu nke ngwaahịa preformed n'oge sintering na ebu, ngwaahịa preformed na-esitere ma mee ka ọ dị jụụ na-aga n'ihu dum n'okpuru nrụgide.Uru nke usoro a dị ka ndị a: ọ dịghị ịkwa akwa na-eme n'usoro ịkpụzi, ịdị arọ molekụla nke ikwu na-ebelata, àgwà ngwaahịa ahụ dị mma, ọ bụghịkwa njedebe nke ịdị arọ molecular.Otú ọ dị, n'ihi obere kọntaktị dị n'etiti akụrụngwa na akụkụ ndị na-ekpo ọkụ na usoro extrusion, ọkụ ọkụ dị ala, nke na-egbochi ngwa ngwa extrusion.
6. Ụzọ nhazi ndị ọzọ;
Enwere ike ịhazi PTFE site na ịkpụzi injection, ịkpụzi calendering, ịkpụzi mkpuchi ma ọ bụ ịkpụzi nke abụọ.
Oge nzipu: Jul-31-2018